Method for manufacturing thick hot-rolled dual-phase steel based on CSP (Compact Strip Production) process
A technology for hot-rolled dual-phase steel and a manufacturing method, which is applied in the field of manufacturing hot-rolled dual-phase steel with a low-cost thickness specification of 590 MPa, can solve the problem that it is difficult to achieve stable matching of chemical composition-process window-structure and properties, and it is impossible to achieve dual-phase steel. Industrial production and application problems, to achieve the effect of reducing the difficulty of smelting, low cost, and ensuring stability
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[0022] The following is a specific embodiment of the present invention. The embodiment is used to explain the present invention and is not used to limit the scope of the present invention.
[0023] The components of the actual molten steel in the embodiment are shown in Table 1 in terms of mass percentage.
[0024] The molten steel with the components of Examples 1 to 3 shown in Table 1 is pretreated → converter top and bottom composite blowing → LF refining treatment → thin slab continuous casting → tunnel furnace soaking → F1~F7 seven-stand hot continuous rolling mill continuous rolling →Laminar cooling system→Super fast cooling system→Reeling.
[0025] Table 1 Chemical composition of specific examples of the present invention (Wt.%)
[0026]
[0027] The continuous casting billet in the tunnel furnace soaking time is 10~25min, control and control the discharge temperature ≥1130℃, the opening temperature ≥1010℃, the F1 rolling mill stand reduction rate ≥40%, the F2 stand reduction r...
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